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Study on the morphogenesis of foetus and reproductive regularity of the finless porpoise, Neophocaena phocaenoides
Jiang Xinfa; Inst. Hydrobiol., Chinese Acad. Sci., Wuhan 430072, China
1995
Source PublicationActa Hydrobiologica Sinica
ISSN1000-3207
Volume19Issue:3Pages:210-215
AbstractAt the early development of the embryo, short bristles were observed on each side of upper jaw in Neophocaena phocaenoides. The number of the bristles varied from 1-3 on the left and 2-3 on the right. Semicircle ear outline was visible. The penis of male foetus was exposed out of body. The swimming organs (flipper, fluke and midway anus to fluke notch) developed prominently. As embryo developed, external ear outline of foetus disappeared and the penis of male foetus concealed in the penial pouch. These morphological changes in the course of the embryo development indicated that cetacean ancestor might have lived on land and that cetacean adapted to water environment when coming into water secondly. In addition, statistical analysis on 17 foetuses and juveniles showed that: the growth rate of foetus was 9.08 cm/month (0.303 cm/day) in Neophocaena phocaenoides, the gestation period may be about 9.4 months in Neophocaena phocaenoides in the Yangtze River, and mating may take place from June to August, parturition time from March to May each year.
Indexed By其他
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/17699
Collection期刊论文
Corresponding AuthorInst. Hydrobiol., Chinese Acad. Sci., Wuhan 430072, China
Recommended Citation
GB/T 7714
Jiang Xinfa,Inst. Hydrobiol., Chinese Acad. Sci., Wuhan 430072, China. Study on the morphogenesis of foetus and reproductive regularity of the finless porpoise, Neophocaena phocaenoides[J]. Acta Hydrobiologica Sinica,1995,19(3):210-215.
APA Jiang Xinfa,&Inst. Hydrobiol., Chinese Acad. Sci., Wuhan 430072, China.(1995).Study on the morphogenesis of foetus and reproductive regularity of the finless porpoise, Neophocaena phocaenoides.Acta Hydrobiologica Sinica,19(3),210-215.
MLA Jiang Xinfa,et al."Study on the morphogenesis of foetus and reproductive regularity of the finless porpoise, Neophocaena phocaenoides".Acta Hydrobiologica Sinica 19.3(1995):210-215.
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